Set Web Storage

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare destructiveHint=true, so the mutating nature is known. The description adds that the value is not echoed, which is useful for privacy. However, it does not disclose whether existing keys are overwritten or other behavioral traits beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description consists of two short, front-loaded sentences that efficiently convey the core action and a key behavioral note. No superfluous text.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple setter tool, the description covers the essential purpose and a notable behavior (no echo). With an output schema present, return values need not be explained. However, it could mention that setting an existing key overwrites it, adding slightly more completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is low (33%), with only the 'value' parameter having a description. The tool description does not add meaning beyond what is already in the schema, merely restating that the value is not echoed. It fails to compensate for the under-documented parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action 'Set' and the resource 'localStorage/sessionStorage item', distinguishing it from sibling tools like storage_get and storage_clear. It uses specific verbs and resource names.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for storing a value but does not provide explicit guidance on when to use this tool versus alternatives such as storage_get or storage_clear. No exclusions or when-not-to-use are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.